Process of making hollow ware from paper-pulp



(No Model.)

H. CARMIGHAEL.

PROGESS OF MAKING HOLLOW WARE FROM PAPER PULP.

No. 342,178. Patented May 18 1886.

N. PETERS. PlmwLuhu nh r, Washingtnn. D40.-

UNITED STATES PATENT OFFICE.

HENRY OARMIGHAEL, OF BRUNSWICK, MAINE.

PROCESS OF MAKING HOLLOW WARE FROM PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 342,178, dated May 18,1886,

Application filed November 9, 1885. Serial No. 1F2,258. (No model.)'

To all whom it may concern.-

ure being applied between the outside shell and the diaphragm, wherebythe watery pulp was pressed against the former and molded into therequired form, the pressure upon the diaphragm expelling a certainproportion of the water through per-lbrationsin the former. Erperience,however, shows that the highest pressure attainable in this way onlydeprives the molded article of a portion of its water, and the articlewill not bear handling without warping or risk of injury before dryingthoroughly.

The object of my invention is to dry the molded articles before removingthem from the press; and to this end my invention consists in forcingair, either hot or cold, between the diaphragm and the former, after thearticle has been molded, whereby all the moisture remaining in the pulpis taken up by the air and carried off with it through the strainer orformer.

In the drawing, the figure represents a sec tion of a press embodying myinvention.

In the drawing, B represents the perforated former, which conforms tothe shape of the vessel required to be made. In the present case it isadapted to form a pail. An outer shell, A, of metal or other suitablematerial,

covers the former, and between the parts A and B is a rubber diaphragm,the edges of which are held between the said parts. The watery pulp isintroduced through the pulptubc D, beneath the diaphragm. After asufficient quantity is introduced the supply of pulp is shut off, andair or water introduced through a pipe, E, under pressure above thediaghragm, the pressure being applied to the pulp to mold it into therequired shape. The pressure applied to the rubberdiaphragm by the wateror air introduced through the pipe E relieves the molded article of acertain proportion of the water contained in the pulp, but not entirely,so I provideapipe, F, connected to the hot or cold air supply, this pipebeing connected at any suitable point, but preferable joined, as shown,to the pulp-tube, so that the hot or cold air may be forced in betweenthe diaphragm C and the former, passing through the pulp and thestrainer, carrying off all the moisture left in the article after thediaphragm pressure. The article is thus thoroughly dried while in thepress, and can be removed and handled without liability to injury.

I claim as my invent-ion"- The hereinbefore described process of forminghollow ware from paper-pulp, consisting in subjecting the pulp froniwhich the article is to be formed to pressure between the flexiblediaphragm and perforated former, and then forcing hot or cold airthrough the molded article while in the press, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY GARMIGHAEL. \T itnesses:

J. P. IVINOHELL,

O. J. RIPLEY.

